#4 is the best. It would be good if the $ were able to be used instead of the S. This would be most possible with #4. Maybe try with a slightly thicker $ also, so it is more readable from afar.
#8 is good. Can you do the same effect on the blue as the green. The effect on the $ is fine. This way the P in Pass would be darker and more readable.
Also perhaps try giving the $ part of the S a little curve to blend more with the design. (this may not look better, just an idea)
Also with #8. Could you try using the same design on the P of pass. Maybe just copy the blue bit from the $ and then put a green bit in to make it a P.
Then the $ and the P could be also used separately as a mini logo.